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113 lines
4.5 KiB
XML
113 lines
4.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.target">
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<refentryinfo>
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<title>systemd.target</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.target</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.target</refname>
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<refpurpose>Target unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>target</replaceable>.target</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in
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<literal>.target</literal> encodes information about a target unit
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of systemd, which is used for grouping units and as well-known
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synchronization points during start-up.</para>
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<para>This unit type has no specific options. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration files. The common
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configuration items are configured in the generic [Unit] and
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[Install] sections. A separate [Target] section does not exist,
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since no target-specific options may be configured.</para>
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<para>Target units do not offer any additional functionality on
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top of the generic functionality provided by units. They exist
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merely to group units via dependencies (useful as boot targets),
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and to establish standardized names for synchronization points
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used in dependencies between units. Among other things, target
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units are a more flexible replacement for SysV runlevels in the
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classic SysV init system. (And for compatibility reasons special
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target units such as <filename>runlevel3.target</filename> exist
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which are used by the SysV runlevel compatibility code in systemd.
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See
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for details).</para>
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</refsect1>
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<refsect1>
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<title>Automatic Dependencies</title>
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<para>Unless <varname>DefaultDependencies=</varname> is set to
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<option>no</option> in either of releated units or an explicit ordering
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dependency is already defined, target units will implicitly complement all
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configured dependencies of type <varname>Wants=</varname> or
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<varname>Requires=</varname> with dependencies of type
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<varname>After=</varname>. Note that <varname>Wants=</varname> or
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<varname>Requires=</varname> must be defined in the target unit itself — if
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you for example define <varname>Wants=</varname>some.target in
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some.service, the implicit ordering will not be added.</para>
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<para>All target units automatically gain <varname>Conflicts=</varname>
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dependency against shutdown.target unless <varname>DefaultDependencies=</varname>
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is set to <option>no</option>.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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